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Copper Damascus? Carter?

So going back more than a few years ago Ryan asked me if I'd ever etched damascus with copper and I of course said no. He then said that we'd have to try it sometime and I said sure but never did. He mentioned it every so often again and again over the years but I never had a damascus knife that I could try this on so I never did it. Finally he sent me one of his Carter neckers to "go for it". Here's the results....

Looks really cool! I've done it by accident before from all the accumulated acid in the etchant from using copper coated welding wire to dandle stuff in. Will be interesting to see what happens with patina, copper is said to accelerate the corrosion steel, though i'm sure moisture would have to be present on a long term basis for it to cause a problem. I would think treated as a normal carbon blade it could be less reactive, other than a darkening of the copper. Ammonia and salts and things like that tend to cause the blue/green patina on copper.